NPRB 1117 Cooperative research to develop new trawl footrope designs to reduce mortality of southern Tanner and snow crabs (Chionoecetes bairdi and C. opilio) incidental to Bering Sea bottom trawl fisheries
Alaska Fisheries Science Center
Data Set
(DS)
| ID: 28425
| Published / External
Created: 2015-10-30
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Last Modified: 2024-01-15
Project (PRJ) | ID: 28424
ID: 28425
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | NPRB 1117 Cooperative research to develop new trawl footrope designs to reduce mortality of southern Tanner and snow crabs (Chionoecetes bairdi and C. opilio) incidental to Bering Sea bottom trawl fisheries |
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Short Name | NPRB 1117 Cooperative research |
* Status | Completed |
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* » Abstract |
Alaska’s Bering Sea is home to some of the world’s most productive groundfish and crab stocks and the fisheries that depend on them. Their spatial overlap creates problems when bottom trawls affect crabs in their paths, either through capture and discard or damage to crabs that remain on the seafloor. We worked with Bering Sea bottom trawlers to develop and test changes to trawl footropes to minimize crab mortality, by reducing damage to crabs that are not caught, and maintaining low crab capture rates. A previous NPRB project (0711) showed that crab mortality from herding cables ahead of trawls could be greatly reduced with simple modifications to raise them above the seafloor. This project did the same for trawl footropes, the part of the trawl located between the leading edge of the trawl net and the seafloor. Such gear changes allow crab mortality to be reduced without restricting trawling to the few areas of the Bering Sea without crabs. |
* Purpose |
The mortality of crabs encountering bottom trawls has long influenced management of both Bering Sea groundfish and crab fisheries. NPRB Project 711 (Rose et al. 2013) provided estimates of mortality rates for crabs that encounter, but escape, trawls and showed how these mortalities could be greatly reduced by slightly raising the trawl components (sweeps) that affect most such crabs. The current project applied similar methods and resources to design and test changes to trawl footropes, the other major trawl component that crabs encounter, to reduce the remaining mortality of crabs due to trawling. This project continued cooperative participation of a group of Bering Sea trawl captains in generating new footrope design concepts, reviewing research plans for practicality and relevance to their commercial fishery, and communicating results to their peers. Three principles were identified for reducing footrope effects on crabs: 1) lower weight-in-water, 2) less seafloor contact area, and 3) higher and wider spaces between contact points. Mortality rates for crabs following contact with footropes incorporating these footrope modifications were all substantially lower than an earlier design tested under NPRB project 711. Acceptable crab bycatch and fish escapement rates resulted from the field experiment. The Bering Sea bottom trawl fleet has adopted usage of the improved footropes. |
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None | mortality |
None | snow crab |
None | Tanner crab |
None | trawl |
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• » Organization | Alaska Fisheries Science Center |
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• » City | Seattle |
• » State/Province | WA |
• Country | USA |
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* Data Set Scope Code | Data Set |
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• Maintenance Frequency | Unknown |
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» Data Presentation Form | Document (digital) |
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* » Support Role | Data Steward |
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* » Date Effective From | 2015-10-29 |
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Person | Towler, Rick |
Email Address | rick.towler@noaa.gov |
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* » Support Role | Distributor |
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* » Date Effective From | 2015-10-29 |
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Organization | Alaska Fisheries Science Center (AFSC) |
Address |
7600 Sand Point Way N.E., Building 4 Seattle, WA 98115 USA |
Email Address | afsc.webmaster@noaa.gov |
Phone | (206) 526-4000 |
Fax | (206) 526-4004 |
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URL | https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center |
Business Hours | 0700-1700 Pacific Time |
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* » Support Role | Metadata Contact |
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* » Date Effective From | 2015-10-29 |
Date Effective To | |
Person | McCarthy, Abigail |
Email Address | abigail.mccarthy@noaa.gov |
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* » Date Effective From | 2015-10-29 |
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Person | Towler, Rick |
Email Address | rick.towler@noaa.gov |
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Currentness Reference | Ground Condition |
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* » Description |
Bering Sea: http://www.marineregions.org/gazetteer.php?p=details&id=4310 |
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* » Start | 2011 |
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* » Security Class | Unclassified |
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» Data Access Procedure |
Go to http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project and email rick.towler@noaa.gov |
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"FISMA Controls are in place to protect stored data from unauthorized access and/or disclosure" |
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» Download URL | http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project |
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The data were reviewed for completeness and accuracy after shipboard collection protocols. |
Data Management
» Have Resources for Management of these Data Been Identified? | No |
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» Approximate Percentage of Budget for these Data Devoted to Data Management | Unknown |
» Do these Data Comply with the Data Access Directive? | Yes |
» Is Access to the Data Limited Based on an Approved Waiver? | No |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | 365 |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
» Actual or Planned Long-Term Data Archive Location | Other |
» If World Data Center or Other, Specify | http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project |
» Approximate Delay Between Data Collection and Archiving | 365 |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
"IT Security and Contingency Plan for the system establishes procedures and applies to the functions, operations, and resources necessary to recover and restore data as hosted in the Western Regional Support Center in Seattle, Washington, following a disruption." |
Lineage
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Video and physical samples were viewed and assessed for degree of trawl interactions with benthos. |
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Catalog Details
Catalog Item ID | 28425 |
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Metadata Record Created By | Abigail McCarthy |
Metadata Record Created | 2015-10-30 15:14+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2024-01-15 12:08+0000 |
Metadata Record Published | 2016-05-18 |
Owner Org | AFSC |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2016-05-18 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2017-05-18 |
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